I would be surprised if Azarenka, Williams, Williams, Sharapova didnt advance.
We would have the current No. 1 and 2 and the real No. 1 and 2 (the real meaning in their prime, of course Venus is long done :p )

Li would normally be a favourite but Im not impressed with her, should pretty much be a shitfest that last QF.
And I have a feeling Caro might score her first win over Sarena.